Put SVGResourceContainer subtypes into their own property trees.

third_party/WebKit/LayoutTests/paint/invalidation/svg/image-with-clip-path-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGRect rect id='r'",
-          "rect": [0, 0, 100, 100],
+          "rect": [-50, -50, 100, 100],
           "reason": "subtree"
         },
         {
           "object": "LayoutSVGRect rect id='r'",
-          "rect": [0, 0, 100, 100],
+          "rect": [-50, -50, 100, 100],
           "reason": "subtree"
         },
         {
           "object": "LayoutSVGContainer g id='g'",
           "rect": [20, 20, 60, 60],
           "reason": "subtree"
         },
         {
           "object": "LayoutSVGContainer g id='g'",
           "rect": [20, 20, 60, 60],
           "reason": "subtree"
         },
         {
           "object": "LayoutSVGContainer g id='g'",
           "rect": [175, 25, 50, 50],
           "reason": "subtree"
         },
         {
-          "object": "LayoutSVGRect rect id='r'",
-          "rect": [175, 25, 50, 50],
-          "reason": "subtree"
-        },
-        {
           "object": "LayoutSVGContainer g id='g'",
           "rect": [0, 0, 10, 10],
           "reason": "subtree"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGContainer g id='g'",
@@ skipping 31 matching lines @@
       "object": "LayoutSVGRect rect id='r'",
       "reason": "subtree"
     },
     {
       "object": "LayoutSVGImage image",
       "reason": "subtree"
     }
   ]
 }